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Snakes continue to grow upon reaching sexual maturity, making an estimate of average weight difficult. However, a length of 6 feet is average for snakes of breeding age. Emerald tree boas originating from the Amazon River basin, may grow much larger, up to 9 feet, with a correspondingly heavier body mass. At hatching, young emerald tree boas weigh between .7 ounces and 1.7 ounces and are 15 inches in length.